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  <title>Document</title>
  <style>
    body, ul{
      margin: 0;
      padding: 0;
    }

    body{
      background-image: url(../images/grid.png);
    }
    svg{
      background-color: rgba(255, 0, 0, 0.1);
    }
  </style>

</head>
<body>

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    <rect id="rectangle2" x="100" y="0" width="50" height="50" fill="red"></rect>
    <rect id="rectangle3" x="200" y="0" width="50" height="50" fill="red"></rect>
  </svg>

  <!-- 
    window.gsap = {}
   -->
   <script src="./libs/gsap.min.js"></script>
   <script>
    function scaleRectangle() {
      // 1 - 3
      gsap.to('#rectangle1', {
        scale: 0.5,
        duration: 1
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      gsap.to('#rectangle2', {
        scale: 0.5,
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      gsap.to('#rectangle3', {
        scale: 0.5,
        duration: 1,
        delay: 2
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    }
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</body>
</html>